Friends of Marshall's kids, Alex 17 and Macaila 14, discovered the gruesome scene after showing up to check on them on Saturday after not having heard from them for numerous days.

The Calaveras County Sheriff's Office reported that both children as well as the family dog were shot once in the head with a handgun.

Marshall's estranged wife and mother of the 2 kids was traveling abroad at the time of the shootings.

Security Agency Officer Wayne Madsen says the 9/11 investigative author Philip Marshall and his children were killed in a “black ops hit” by the CIA, dismissing the suicide hypothesis. Marshall was afraid of being silenced for his revelations about 9/11, Madsen said, noting that a side door the investigator never used was wide open when his dead body was found.

Marshall believed the former US President George Bush had pulled off the 9/11 attack to foment a government coup. In his fourth book, he was supposed to disclose blockbuster information.

Press TV has conducted an interview with Dr. Kevin Barrett, an American author and political expert in Madison, Wisconsin, to further discuss the issue. Barrett is joined by Lee Kaplan, investigative journalist from Berkley. Watch the video below: